Windows 10 x64 Nvidia 1070
Short description of error
The continuous grabbing/tweaking which works like selecting and dragging at the same time. This works perfectly with 2.79x where one can either use the left click or the right click to select and still use grab and drag (both in object level and mesh edit level).
In the current state of 2.8 it seems that this functionality was never thought to be part of the new branch or it is broken. As a long time user of Blender I highly appreciate if this functionality follows the behavior of the previous Blender versions, since this functionality is one of those small things that truely separates Blender from other apps in a posiitive way. In fact this traditional way of editing in Blender was a step forward, and has been a shining light of how mesh editing can be productive, and was a good example to other apps. I do hope this is not thrown into the thrash bin while trying to invent new ways of dealing with mouse selections, which is fine that is how we progress. I just hope that a good balanced progress wont get right of the "left click"+"release confirms", which is continuous dragging/grabbing.
Exact steps for others to reproduce the error
1- Make sure Release confirms enabled
2- Test them in mesh edit mode, where you use your right click to move vertices around, like click and drag at the same time, since this functionality only works on a single entity.
3- Now open your user settings and change "Selection With" to left click.
4- Now try step 2 with your new mouse selection setting. As you see there is no "continuous dragging/grabbing" anymore when left mouse is the selector.
This expected behavior does not also work with 2.7x keymaps.
It seems to me that changing selection method has no affect on bringing the old behavior, rather selecting the left setting makes right click a menu thing. I personally would prefer if the functionality is just reversed, not complicated with new menus and functionalities.
The reason why the original method was fundemantally beautiful has to do with how graphics tablets operate the left click. In generaly your graphic pen's left click is dragging on the surface while touching the surface , therefor the grab and drag functionality works flawless, like heavenly match. This new behavior is truly a setback unfortunately for those artists who use a tablet